package com.ysd.uitl;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class DBManager {
	private final static String DRIVER="com.mysql.jdbc.Driver";
	private final static String URL="jdbc:mysql://localhost:3306/shuju";
	private final static String USER="root";
	private final static String PWD="Q20010307";
	//��ȡ����
	public static Connection getConnection() {
		try {
			//��������
			Class.forName(DRIVER);
			//��������
			Connection conn=DriverManager.getConnection(URL, USER, PWD);
			return conn;//��������
		} catch (ClassNotFoundException e) {
			e.printStackTrace();
		} catch (SQLException e) {
			e.printStackTrace();
		}
		return null;
	}
	//ִ��sql���
	public static int executeUpdate(String sql){
		Connection conn=getConnection();
		Statement st=null;
		try {
			//����statement����ִ��sql���
			 st=conn.createStatement();
			int n=st.executeUpdate(sql);
			return n;
		} catch (SQLException e) {
			e.printStackTrace();
			return -1;
		} finally {
			closeAll(conn,st,null);
		}
	}

	//�ر���
	public static void closeAll(Connection conn,Statement st,ResultSet rs) {
			try {
				if(rs!=null) {
					rs.close();
				}
				if(st!=null) {
					st.close();
				}
				if(conn!=null) {
					conn.close();
				}
			} catch (SQLException e) {
				e.printStackTrace();
			}
	}
}
